Say the roofline in the back of a car is more or less level (black). Should the Kammback abruptly start dropping at a 11 degree angle (green), or should there be a rounded transition first (red)? (The angles are exaggerated)
Intuition whispers that the sharp edge between roof and Kammy would cause detactment of airflow (blue):
while a rounded transition would help guide the airflow smoothly down the Kammback:
On the other hand, maybe intuition isn't always the best tool in aerodynamics, and maybe the 11 degree angle isn't enought to detach airflow?
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e·co·mod·ding: the art of turning vehicles into what they should be
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[Old] Piwoslaw's Peugeot 307sw modding thread